Steam-boiler furnace.



PATENTED JULY 5, 1904 J. W- STILLWELL. STEAM BOILER FURNACE. APPLIUATIONFILED OCT-16, 1903- NO MODEL.

Z SHEETS-8BR l.

Mg i.

iii}

hum

m yam WW 4; m w A g No. 764,314, PATENTED JULY 5, 1904.

J. W. STILLWELL.

AM LER FURNAGE.'

PP IOA ILED 00T.16. 1903.

N0 .MODEL. 2 SKEETS-SHEET 2 Fllg.

UNITED STATES Patented July 5, 1904.

PATENT OFFICE.

STEAM-BOILER FURNACE.

SPECIFICATION forming part of Letters Patent No. 764,314, dated July 5,1904,

Application filed October 16, 1903. $orial No. 177,256. (No model.)

To all whom zit may concern.-

Be it known that I, JosEPI-I W. STILLWELL, a citizen of the UnitedStates, residing in the city of New York, borough of Brooklyn, county ofKings, and State of New York, have invented certain new and usefulImprovements in Steam-Boiler Furnaces, of which the following is aspecification suflicient to enable others skilled in the art to whichthe invention appertains to make and use the same.

My present invention relates to means for effecting the perfectcombustion of all the inflammable constituents of fuel used in heating asteam-boiler, thereby preventing the formation of smoke, as set forth inmy application for patent, Serial No. 145,704, iiled March 2,

1903, and allowed June 27, 1903; and the invention consists in thespecial construction and arrangement of parts hereinafter described andclaimed specifically whereby the apparatus is rendered more durable andeffective in operation.

In the accompanying drawings, Figure 1 is a vertical sectional elevationof a boiler-fur nace constructed according to my invention. Fig. 2 is atransverse vertical section upon plane of line 2 2, Fig. 1, lookingtoward the front end of the furnace. Fig. 3 is a similar section uponplane of line 3 3, Fig. 1, looking rearward. Fig. 4: is a sectional viewof one of the telescoplc oints in the condult. Fig. 5 1s a sectionalview of the mouth of a con- .duit, taken upon plane of line 5 5, Fig. 1.

Fig. 6 is a horizontal section upon plane of line 6 6, Fig. 1, theboiler being omitted. Fig. 7 is a horizontal section upon plane of line7 7, Fig. 1, showing the conduit-pipe,

&c., in elevation; Fig. 8, a front elevation of boiler.

The furnace-walls or brickwork is lettered A and sustains a horizontaltubular boiler 13.

F is the iirc-box or combustion-chainher,

into which the fuel is introduced in the usual manner.

The products of combustion from the firebox F pass over the bridges a a,through the tubes 7) of the boiler 13, and into the passage 0, whichleads to the chimney C. In the passage 0 between the boiler-tubes 7) andthe chimney G is interposed the open flaring mouth 6 of the conduit-pipeE, which extends to the lire-box F, so thatthe products of combustiondrawn into the open months a may be returned directly to the saidlire-box. I effect this return of products of combustion to the fire-boxby the injection of steam into the lower horizontal extension of theconduit E in the direction of the tire-box, so that an induced currentis created within the conduit E, as in'my former application, by the useof a jet G. I have found by experience and experiment, however, that Ican obtain better, quicker, and more positive results by using asupplementary jet H at the mouth 0 of the conduit, and this constructionconstitutes one of the features of my present invention, the inducedcurrent created by the jet G through the vertical extension of the pipeE being aided and abetted by the pressure created by the supplementaryjet l-l within the upper horizontal member of the conduit E. Theproximity of the supplemental jet to the uptake-passage c aidsmaterially in diverting the products of combustion rising from theboiler-tubes into the conduit E.

The conduit E where it passes below the boiler is supported in suchmanner as to be exposed directly to contact with the products ofcombustion passing from the lire-box to the rear of the boiler. To thisend i support it upon a shelf a, projecting from the inner side wall ofthe furnace, said shelf being constituted of lire-bricks built into theside wall and formed with upwardly-projeeting flanges a, which sustainthe conduit laterally in position upon the shelf a, as will beunderstood by reference to Fig. 2. The lower extension of the conduit Ebeing also exposed to intense heat, I make provision for avoiding thestrain and rupture that would otherwise occur by making this lowersection or extension of the conduit E in two parts united in the form ofa telescopic joint 0 I having found by actual experience that the lowerhorizontal section of the conduit E soon becomes useless unlessprovision is thus made to have the parts of the conduit slide freely oneupon the other. This feature of my invention is the result of carefulinvestigation and experiment, and by it I greatly lengthen the life andusefulness of the conduit. In fact, while the returnconduits andconnections as heretofore constructed and used by me have been practicaland operative the need of frequently replacing the lower extension ofthe conduit has been a serious difficulty, which I have at last overcomeby the means herein set forth. While not so essential as in the case ofthe lower extension of the conduit E, the upper horizontal section ofthe said conduit, as indicated in Figs. 1 and 7 of the drawings, (andeven the vertical portion of the conduit,) may, if so desired, be thusprotected against the effects of expansion and contraction.

Another feature of novelty in my present structure consists in the useof one or more relatively broad flat nozzles e at the extremity of theconduit E within the fire-box arranged to discharge the returnedproducts of combustion over the grate-bars and toward the rear of thefurnace, as will be readily understood by reference to Figs. 1, 2, and6. By this means I attain an even uniform distribution of such returnedproducts of combustion over the bed of incandescent fuel upon the grate,and thereby insure the reduction of all unconsumed carbon and otherinflammable products of combustion withdrawn by the conduit E from theuptake-passage 0.

The steam-pipe 2' for conducting steam under pressure to theinduction-jet G is exposed to the contact with the products ofcombustion, as in my former construction, for the purpose ofsuperheating the steam injected into the lower horizontal member of theconduit E by the jet G. I prefer also to superheat the steam injected bythe forcing-jet H into the upper horizontal member of the conduit E andfor this reason pass the steam through a superheating drum or chamber D,situated in the uptake-passage c, where it is exposed to direct contactwith the hot products of combustion escaping from the forward ends ofthe boiler-tubes.

Steam may be supplied to the pipe 21, passing to the induction-jet G andto the drum D or the pipes (Z, connecting directly with the force-jet Heither from the steam-drum b of the boiler or from an independent sourceby means of suitable piping.

Where the described return-conduit E and connections are duplicated uponopposite sides of the boiler, as is usually preferable in practice underordinary conditions of use, I employ what may be designated as aninverted deflector L, extending between the two mouths f thereturn-conduitsE for the purpose of intercepting the products ofcombustion escaping from the boiler-tubes toward the chimney anddirectingthe said proclucts so intercepted into the return-conduits E.This deflector is concave on its under side and is preferably depressedcentrally, converging upward in opposite directions, with itsextremities extending directly into the mouths c c of the conduits E E.By its use a much larger percentage of unconsumed products of combustionis returned to the fire-box.

What I claim as my invention, and desire to secure by Letters Patent, is

1. The combination of a steam-boiler and furnace, theuptake-passage,return-conduits situated upon opposite sides of theboiler and adjacent to the inner side walls of the furnace, saidconduits being formed with mouths and the other extremities of saidreturn-conduits extending and opening into the firebox in closeproximity to the grate, steamjets in proximity to the mouths of saidconduits arranged to force products of combustion into said conduits,other steam-jets situated in proximity to the uptake-passage and betweensaid forcingjets and the fire-box and arranged to create an induction insaid re turn-conduits, and oppositely-inclined deflectors extendingbetween the mouths of the return-conduits in the passage between theboiler-tubes and the chimney, arranged to intercept products ofcombustion and guide them into the mouths of the said return-conduitsfor the purpose described.

2. The combination of a steam-boiler and furnace, the uptake-passage,return-conduits situated upon opposite sides of the boiler and adjacentto the inner side walls of the furnace, said conduits being formed withmouths opening into the passage between the boilertubes and the chimney,the other extremities of said return-conduits extending and opening intothe fire-box in close proximity to the grate, steam-jets in proximity tothe mouths of said conduits, other steam-jets situated in proximity tothe uptake-passage and between said forcing-jets and the fire-box andarranged to create an induction in said return-conduits, andoppositely-inclined deflectors connecting the mouths of thereturn-conduits in the passage between the boiler-tubes and the chimney,arranged to intercept products of combustion and guide them into themouths of said returnconduits, and a steam-drum in the passage betweenthe boiler-tubes and the chimney, arranged to supply superheated steamto the forcing-jets in the mouths of the said returnconduits, as and forthe purpose set forth.

3. The combination of a steam-boiler and furnace, a return-conduitarranged adjacent to the side walls of the furnace with a mouth openinginto the passage between the b0ilerjecting steam under pressure intosaid return tubes and the chimney, the other end of said conduit in thedirection of the fire box for return-conduit opening" lnto the fire-boxin the purpose set forth.

close proximity to the grate, a shelf of fire- JOSEPH W. STILLVVELL.brick supporting said return-conduit under Witnesses: the boiler, saidshelf being formed with a re- 1). W. GARDNER,

taming-flange as described, and means for in FRANK E. RoAoH.

